Semi-automatic firearm

ABSTRACT

The present invention relates to a semi-automatic firearm having a receiver with an internal chamber formed therein. Slidably confined within the chamber is a spring loaded striker which is aligned with a firing pin and adapted to strike the latter to fire a cartridge positioned therein. A bolt is likewise slidably mounted within the chamber and responsive to the firing of the cartridge to recoil and engage said striker, moving said striker back to a cocked position where the striker engages a sear. The firearm of the present invention further includes a manual cocking mechanism for positioning said striker in the cocked position in the absence of a recoil movement by the bolt.

United States Patent 91 Tant [ Dec. 31, 1974 1 1 SEMI-AUTOMATIC FIREARM [76] Inventor: William A. Tant, 1220 Daladams St., Raleigh, NC. 27603 [22] Filed: Apr. 13, 1973 [21 Appl. No 350,747

52 US; Cl 89/197, 42/25, 42/50, 89/144, 89/148, 89/199 [51] Int. Cl. F4111 5/00, F41C1 11/02 [58] Field of Search 42/18, 50; 89/197 [56] 1 References Cited UNITED STATES PATENTS 537,958 4/1895 Ashton et a1. 42/18 1,446,763 2/1923 Nelson 42/18 1,867,569 7/1932 Horger 89/197 2,765,559 10/1956 MOI'l'lS 42/18 FOREIGN PATENTS OR APPLICATIONS Germany 42/50 Primary ExaminerStephen C. Bentley Attorney, Agent, or Firm-Mills and Coats 5 7] ABSTRACT The present invention relates to a semi-automatic firearm having a receiver with an internal chamber formed therein. Slidably confined within the chamber is a spring loaded striker which is aligned with a firing pin and adapted to strike the latter to firea cartridge positioned therein. A bolt is likewise slidably mounted within the chamber and responsive to the firing of the cartridge to recoil and engage said striker, moving said striker back to a cocked position where the striker engages a scar. The firearm of thepresent invention further includes a manual cocking'mechanism for positioning said striker in the cocked position in the absence of a recoil movement by the bolt.

14 Claims, 13 Drawing Figures a 0mm PATENTEU macs 1 1974 PATENTEB um I ma FIG? FIGIZ FIGII FIGIO FIGS) 1 SEMI-AUTOMATIC FIREARM the form of a rifle or a small handgun. By semiautomatic, one means that the firearm may be repeatedly fired, without cocking, by repeatedly actuating a trigger mechanism. Many semi-automatic firearms utilize the recoil movement of a bolt to urge a striker back into a cocked position after each firing.

To provide for repeated short interval firing, it is necessary to provide means for feeding cartridges one at a time into the receiver of the firearm, and means for extracting and ejecting the fired shell after each firing.

Such feeding mechanisms are often in the form of a magazine clip and the extracting and ejecting of the shell has been accomplished in many ways.

Basically a semi-automatic firearm comprises three basic groups of mechanisms: (1) a firing and recocking mechanism, (2) a cartridge feeding mechanism, and (3) shell extracting and ejecting mechanism. In order for the firearm to operate properly, it is necessary that all of these mechanisms cooperate in timed relationship during the firing of the firearm.

In many semi-automatics, these mechanisms have been quite complex and have involved a great number of moving parts. This complexity has often resulted in the firearm requiring frequent repair and maintenance.

Moreover, the likelihood of jamming and malfunctioning is often'increased with firearms employing numerous sophisticated mechanisms with many moving parts.

In view of the foregoing, the-present invention has been devised and presents a relatively simple semiautomatic firearm. The firearm comprises a bolt slidably mounted within a chamber formed in a receiver. The bolt carries an extractor and ejector assembly that is operative upon recoil of the bolt to engage and eject the fired shell. Also, the bolt upon recoil engages a striker and urges the latter back to a cocked position, after which the bolt is biased back toward a firing point. The bolt further carries a cartridge feed guide which engages the upper most cartridge of the magazine clip and urges thecartridge into the receiver and into the firing position. Consequently, after the positioning of the striker in the cocked position due to the recoil movement of the bolt, the firearm is make ready to fire.

In those cases where the striker has been released from the cocked position and there is no cartridge to furnish the recoil movement, the firearm of the present striker to position the same in a cocked position in response to the firing of a cartridge.

Still a further object of the present invention is to provide a bolt assembly with a cartridge feed guide for positioning the individual cartridges within the receiver of the firearm for firing, and an extractor and ejector assembly carried by said bolt for extracting and ejecting fired shells from the receiver, said extractor and ejector assembly being actuated in response to the recoil movement of said bolt.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of the firearm receiver of the present invention with the outer housing structure being broken away to better illustrate the internal structure thereof;

FIG. 2 is a top plan view of the firearm of the present invention with portions thereof being broken away to better illustrate the bolt, extractor and ejector assembly thereof;

FIG. 3 is a bottom plan view of the portion of the firearm shown in FIG. 2;

FIG. 4 is a sectional view taken along lines 4-4 in FIG. 1;

FIG. 5 is a frontelevational view of the magazine clip utilized by the firearm of the present invention;

FIG. 7 is an end elevational view of the same;

FIG. 8 is a top-plan view of the magazine clip;

FIG. 9 is a bottom plan view of such clip;

FIG. 10 is a bottom plan view of a guide plate utilized by the magazine clip to support each row of cartridges;

FIG. 11 is a top plan view of the guide plate;

FIG. 12 is a sectional view of magazine clip taken along lines 12-12 of FIG. 6; and

FIG. 13 is a fragmentary sectional view showing the receiver connection to the barrel.

With further reference to the drawings, particularly FIG. 1, the firearm of the present invention is shown therein and indicated generally at 10. The firearm l0 basically comprises a receiver 12 which has a longitudinal chamber 13 formed therein. Threaded into thefront end of the receiver chamber 13 is a barrel 14 (only a portion of which is shown).

Insertable within the receiver 12 is a cartridge feed means 24 which is adapted to feed one cartridge at a time into the receiver 12. v

Disposed within the receiver chamber 13 is a firing mechanism 16. The firing mechanism 16 is operatively invention utilizes a manual finger level which engages I the bolt and urges the same back against the striker, moving the striker to the cocked position.

It is, therefore, an object of the present invention to provide a semi-automatic firearm that is relatively simple in construction, easy to operate, and functions reliably without malfunctioning or jamming.

A further object of the present invention resides in the provision of an improved firing mechanism for a semi-automatic firearm, said improved mechanism comprising an axially aligned striker and bolt assembly with said bolt being adapted to recoil and engage said connected to a trigger mechanism 18, the trigger mechanism being adapted to actuate the firing mechanism 16. Operatively associated with the trigger mechanism 18 is a safety interlock 20 which is particularly adapted to prevent inadvertent actuation of firing mechanism 16. Since firearm 10 is of the semi-automatic type, it is necessary to provide some means for extracting and ejecting each-shell after firing. As shown in FIG. 2, the present disclosure provides an extractor and ejector assembly 22 that is adapted to extract and eject each shell after firing.

Viewing the firearm 10 in greater detail, it is seen that a bolt 26 is slidably mounted on a guide 13a formed within the receiver chamber 13. Formed along the underside of the bolt 26 is a cartridge feed guide 27 which, as will be described in greater detail subsequently, functions to engage the upper most cartridge of the cartridge feed means and to urge that cartridge into the receiver 12 toward a firing point and into a firing chamber therein. More particularly, the firing position is that position assumed by a respective cartridge just prior to being fired. As seen in FIG. 1, the cartridge denoted by the letter C is disposed in the firing position and as seen therein is in alignment with the bolt 26.

Slidably disposed above the bolt 26 is a firing pin 28,

the front portion of the firing pin being aligned so as to engage the cartridge C disposed in the firing chamber. A retracting spring 30 engages a front portion of the firing pin 28 and biases the same rearwardly from the firing position.

Fixed to the bolt 26 and extending rearwardly therefrom through the receiver chamber 13 is a bolt shaft 32 that has a stop 34 fixed intermediately thereon. In order to bias the bolt toward the firing chamber, a return spring 36 is interposed between the stop 34 and a rear portion of the receiver unit 12 (FIG. 1). The return spring 36 is normally held in compression and exerts a forward force against the stop 34 and consequently biases the bolt 26 forwardly, as viewed in FIG. 1. To confine the return spring 36 and to allow the shaft 32 to freely reciprocate within the receiver chamber 13, a sleeve 38 is disposed within the receiver chamber 13 and is disposed in coaxial relationship with the bolt shaft 32.

Disposed within the receiver chamber 13 rearwardly of the bolt 26 and firing pin 28 is a spring loaded striker 40. Striker 40 is slidably mounted within the receiver chamber 13 and is generally aligned with the firing pin 28 and bolt 26 and is particularly adapted to strike the firing pin with an impact great enough to cause the firing pin to fire the cartridge C. Viewing the striker 40 in detail, it is seen that it is an open, generally cylindrical type structure having a head 40a, a front cylindrical wall 40b and a rear cylindrical wall 400. The head 40a includes an opening therein for receiving the bolt shaft 32 and consequently allows the bolt to move independently of the striker 40. The flange area between the front and rear cylindrical walls 40b and 400 serves as a sear latch and is denoted in the drawing as 40d.

To biase the striker 40 toward the firing pin 28, there is provided a striker spring 42 that is disposed outwardly of the bolt return spring 36 and is held between a rear portion of the receiver 12 and the inner flange area between the front and rear walls 40b and 400.

Turning to a detail discussion of the trigger mechanism 18, a trigger 44 is movably mounted within the receiver 12 and extends downwardly therefrom through a trigger guard. A trigger link 46 forms a part of the trigger structure 44 and is spring biased by a trigger spring 48 that normally urges the trigger 44 toward a forward position. Pivotably-mounted to the trigger link 46 by a pivot pin 52 is an interconnecting link 50. The interconnecting link is biased clockwise, as viewed in FIG. 1, by a spring and plunger assembly 59 that extends rearwardly from the trigger structure 44 and engages the lower end of the interconnecting link 50. Clockwise movement of the interconnecting link 50 is normally limited by a guide stop 54 secured to the receiver l2 and extending horizontally across the path of the upper portion of the link 50.

Interconnecting link 50 includes an upper stop area 58a that normally engages a sway link 56, the sway link being pivotably mounted to the receiver 12 about a transverse axis and normally biased for counterclockwise movement by a spring 58. As particularly seen in FIG. 1, the front end of the sway link 56 is secured to a sear 60 by a pin 62. Because sway link 56 is biased counterclockwise, as viewed in FIG. 1, the upper portion of the sear 60 is biased upwardly through the receiver chamber 13 and is adapted to engage the flanged sear latch area 40d formed about the striker 40. Also, it is seen that the upper portion of the sear 60 is cammed. This cammed upper portion allows the striker to move rearwardly therepass depressing the sear 60 until the latched area 40d passes the upper portion of the sear. Because the sway length 56 is biased counterclockwise, once the flange area 40a passes the sear 60, the sear is urged upwardly through the receiving chamber 13 where it serves as a stop and prevents the striker from moving forward to strike the firing pin 28. v

In order to prevent the inadvertent firing of a firearm 10, a safety interlock mechanism 20 is operatively interconnected to the trigger mechanism 18. Viewing the safety interlock 20 in greater detail, it is seen that a safety shaft 64 extends through a longitudinal chamber 65 formed within the receiver 12, as best seen in FIG. 1. Safety rod 64 also extends through an opening in the sear 60. Formed on the end of the safety rod that extends as through the sear 60 is a safety stop 66, the safety stop being of greater diameter than the safety rod 64 and having an outside diameter slightly less than the inside diameter of the opening through the sear. Thus, it is appreciated that by positioning the safety rod such that the stop 66 is disposed within the opening through the sear 60 prohibits the sear from being moved up and down, consequently preventing inadvertent actuation of the trigger mechanism 18.

To actuate the safety rod 64, there is provided a thumb switch 68 which is slidably mounted on a slide surface 70 disposed rearwardly of the receiver 12. Switch 68 includes a pin 18 that is disposed rearwardly of a pair of notches 72 formed on the underside of the slide surface 70. A spring 76 is interposed between the underside of the slide surface 70 and the locking pin 78, that includes a forward curled position adapted to engage the notches 72. Therefore, as viewed in FIG. 1, positioning the thumb switch 68 such that it is in the rear most position results in the safety being on. On the other hand, the positioning of the thumb switch 68 in the forward most position has the effect of removing the safety stop 66 from the opening within the sear 60 and consequently the safety is off."

The firearm 10 may be manually cocked by a finger lever 80 which is pivotably mounted to a toggle link 84 by a pivot pin 82. The toggle link 84 is in turn pivotably mounted to the receiver 12 by a pivot pin 86. The upper portion of the finger lever 80 is pivotably connected to a loading slide 88, the loading slide being disposed on the guide structure 13a of the receiver chamber 13 and particularly spaced forwardly of a flanged area of the bolt 26. The guide is engageable with the flange area for moving the entire bolt 26 rearwardly against the striker for effectuating a manual cocking of the same.

Consequently in those cases where the striker is not cocked by the recoil movement of the bolt 26, a manual cocking may be realized by pivoting the finger lever 80 about the pivot pin 82. In order to move the loading slide 80 rearwardly, it becomes necessary for the toggle link 84 to pivot clockwise about the pivot pin 86. Therefore, as the toggle link 84 pivots clockwise, the finger lever 80 is free to pivot counterclockwise, thereby allowing the loading slide 88 to engage the bolt 26 and push the same rearwardly against the striker 40 and move the same rearwardly pass the sear 60 to the cocked position, as illustrated in FIG. 1.

The extractor and ejector assembly, as viewed in FIG. 2, is carried by the bolt 26. With reference to the extractor and ejector assembly 26, it is seen that this assembly basically comprises an extractor 90 and an ejector 92, both the extractor and ejector being pivotably mounted by a pin 93 along side the bolt 26. Disposed within the bolt 26'is a pair of spaced apart spring and plunger assemblies 94 and 96, spring and plunger 94 being engaged with the rear end of extractor 90 and biasing the head thereof inwardly relative to the receiving chamber 13 and spring and plunger assembly 94 being engaged with the front portion of the ejector 92 and biasing the same outwardly toward the wall structure of the receiving chamber.

Disposed within the receiving chamber 13 adjacent the firing chamber where the rim of the cartridge is disposed when the cartridge is positioned in the firing position, is an extractor cam 98. The extractor cam 98 is aligned with the head of the extractor 90 and functions to bias the same around the forward edge of the cartridge rim'such that upon recoil, the extractor 90 functions to pull the shell rearwardly. As the shell is being pulled rearwardly, by the extractor 90, the ejector 92 engages a forward cam surface 100 (FIG. 2) formed along the edge of the receiving chamber 13. This first ejector cam 100 causes the head of the ejector 92 to slightly engage the cartrdige shell so as to maintain alignment thereof as the shell is being extracted.

Spaced rearwardly of the forward ejector cam 100 is a second ejectorcam'l02. The second ejector cam 102 furtherengages the ejector 92 biasing it still further inwardly toward the center of the receiving chamber. As the ejector 92 moves inwardly after engaging the second ejector cam 102, the shell is ejected through an opening formed in the side of the receiving chamber 12.

The cartridge feed means indicated generally at 24 is in the form of a magazine clip and is adapted to be inserted into the lower portion of the receiver 12 such that the top of the clip extends adjacent a receiver chamber opening formed just beneath the normal position of the cartridge guide 27 carried by bolt 26. To maintain the. magazine clip within the receiver 12, a clip lock 104 is pivotably mounted to the receiver and has a locking end that is engageable with the outside of the magazine clip for holding the same within the receiver. i

Turning to FIGS. 5 through'l2, the magazine clip of the present invention is shown therein and basically comprises a bottom plate 106 having a pair of spaced apart sides 108 and 110 extending upwardly therefrom. As illustrated in FIG. 12, the upper portion of the sides 108 and 110 are converged inwardly toward each other defining an opening about the top of the clip just large enough for a single cartridge to exit therefrom. The magazine clip also includes front and rear end plates 112 and 114 respectively, with each end plate extending between the two sides 108 and 110.

One significant feature of the magazine clip 24 is that its design permits two rows of cartridges to be placed therein. To accomplish this, a center-partition wall 116 extends upwardly from the bottom plate 106 dividing the clip 124 into two separate cartridge chambers 130 and 132. A front portion of the partition 116 extends forwardly and is confined within a partition guide 118 disposed along the front edge of the magazine clip 24. A guide plate 120 is disposed within the clip 24 and is supported about the underside thereof by a plurality of springs 122, the springs extending between the bottom plate 106 and the guide plate 120 and normally biasing the guide plate upwardly toward the top opening of the clip.

More particularly, the guide plate 120 includes a pair of elongated cavities 124 formed in the underside thereof. These cavities 124 receive the top portion of the springs 122. Additionally, the guide plate 120 includes a rectangular partition cutout 126 which provides an opening for the center partition 116. Since only one cartridge at a time can exit through the top.

opening of the clip 24, it becomes desirable to stagger the individual cartridges of each row such that only one cartridge at a time enters the upper most area thereof. To accomplish this staggering, the guide plate 120 is provided with an elevated side 128 which elevates the cartridges disposed thereover approximately one-half a cartridge width relative to the adjacent row. The effect of such elevation assures alternate row cartridge feedmg.

In operation, before firing the striker 40 is normally in the cocked position as shown in FIG. 1 and a cartridge C is positioned in the firing chamber, also as illustrated in FIG. 1. Upon actuating the trigger mechanism '18, the sear 60 is disengaged from the striker 40 allowing the latter to move forward and impact against the firing pin 28, which in turnfires the cartridge C. The firing of the cartridge C results in a recoil movement of the bolt 26. As the bolt 26 recoils, the extractor and ejector assembly 22 is operative to extract and eject the fired shell. The bolt 26 continues to recoil and engages the head 40a of the striker 40 and pushes the same back to the'cocked position where the sear 60 engages the flanged area 40d to hold the striker in this cocked position. Thus in this type of operation the firearm 10 is recocked by the coil movement of the bolt 26 and consequently can be appropriately termed a semiautomatic firearm.

But in cases where the striker has been releasedfrom the sear 60 and there is no cartridge to yield the recoil movement, the firearm of the present invention may be manually cocked. This manual cocking is accomplished by pivoting the finger lever counterclockwise about the edge of the striker 40. As the bolt 26 is urged rearwardly, the striker passes'the sear 60 and the sear engages the flanged area 40d and consequently the striker is held in the cocked position and is ready forfiring.

It is appreciated that after each firing and after the bolt has recoiled, the bolt is then urged forward by the presence of the return spring 36. During this return movement, the cartridge feed guide 27 engages the upper most cartridge of the clip 24 and urges the same into the receiver 12 and on into the firing chamber as indicated by cartridge in FIG. 1.

Finally, as best seen in FIG. 6, it is noted that the center partition 116 generally acts to prohibit the cartridges from moving forward in the magazine clip since the rear rim portion of each cartridge shell overlaps the plane of the partition. Also, as illustrated in FIG. 6, the magazine clip includes an upper cam 140 disposed interiorly of the clip along an upper portion of the rear wall 114. This cam acts to urge the upper most cartridge forwardly within the magazine clip which facilitates the feeding of the individual cartridges into the receiver.

From the foregoing it is clear that the disclosure of the present invention relates a simple yet efficient semiautomatic firearm that is relatively inexpensive to produce. The present invention also provides an improved clip means for use with firearms that is reliable for use over an extended period.

The terms upper, lower, forward, rearward," etc., have been used herein merely for the convenience of the foregoing specification and in the appended claims to describe the semi-automatic firearm and its parts as oriented in the drawings. lt is to be understood, however, that these terms are in no way limiting to the invention since the semi-automatic firearm may obviously be disposed in many different positions when in actual use.

The present invention, of course, may be carried out in other specific ways than those herein set forth without departing from the spirit and essential characteristics of the invention. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range are intended to be embraced herein.

What is claimed is:

l. A semi-automatic firearm comprising: a receiver having a longitudinal chamber formed therein; means for inserting one cartridge at a time into said receiver and moving the inserted cartridge to a firing chamber; a firing pin means movably mounted in said longitudinal chamber for striking and firing a respective cartridge positioned in said firing chamber; a striker assembly mounted in said chamber in alignment with and biased toward said firing pin means, said striker being movable between a cocked position and firing pin striking position; a movably mounted sear rearwardly spaced from said firing pin means and movable between a striker engaged position and a disengaged position. said sear normally assuming said striker engaged position where it acts to hold said striker in said cocked position, said sear being further operative to disengage said striker allowing the latter to strike said firing pin means; a trigger mechanism operatively connected to said sear for moving the same from said striker engaged position to said disengaged position and back to said striker engaged position; a safety interlock mechanism associated with said receiver and operative to lock and unlock said sear; a bolt slidably mounted in said chamber between said striker and firing point and biased toward said firing point, said bolt being aligned with said striker and operative upon firing to recoil and engage said striker, causing said striker to be moved back to said cocked position for engagement with said sear; a bolt shaft fixed to said bolt and extending rearwardly therefrom through the internal chamber formed within said receiver; a stop fixed intermediately on said bolt shaft; a bolt return spring disposed between said stop and the rear portion of said receiver, thereby biasing said bolt toward said firing point; an extractor and ejector assembly carried by said bolt; means for actuating said extractor and ejector assembly in response to the recoil movement of said bolt; and means-for manually moving said striker back to said cocked position where said striker is engaged and held by said sear, thereby enabling said firearm to be cocked in the absence of a recoil movement from said bolt.-

2. The semi-automatic firearm of claim 1 wherein said extractor and ejector assembly comprises a pivotably mounted shell rim hook adapted to engage and extract the cartridge shell from the firing point; and a pivotably mounted ejector arm adapted to engage theextracted shell and eject the same from the receiver.

3. The semi-automatic firearm of claim 2 wherein said means for actuating said extractor and ejector assembly comprises cam means formed along said internal chamber of said receiver for engaging said ejector arm and biasing the same toward the shell causing the shell to be ejected from said receiver.

4. The semi-automatic firearm of claim 3 wherein said means for actuating said extractor and ejector assembly further includes spring biased means for engag-' ing both said shell rim hook and said ejector arm, said spring biasing means being operative to normally bias said shell rim hook into engagement with the rim of the particular cartridge located at the firing point and further operative to normally bias said ejector arm away from the cartridge shell.

5. The semi-automatic firearm of claim 1 wherein said manual cocking mechanism comprises: a toggle link pivotably mounted about a transverse axis to said receiver; a finger lever pivotably mounted to said toggle link about an axis parallel to the pivot axis of said toggle link; and a cocking slide secured to said finger lever and engageable with said bolt for pushing the bolt rearwardly against said striker and positioning 'said striker in said cocked position. 6. The semi-automatic firearm of claim 1 wherein said striker includes a central opening formed therein for receiving said bolt shaft, and wherein said striker is slidably mounted along said bolt shaft in coaxial relationship therewith.

7. The semi-automatic firearm of claim 6 including a striker spring disposed between said striker and the rear portion of said receiver unit, with said striker being disposed outwardly of said bolt return spring.

8. The semi-automatic firearm of claim 7 including an open sleeve disposed in the rear portion of the internal chamber formed within said receiver, said sleeve separating said bolt return spring from said striker spring and aligned so as to receive said bolt shaft therethrough as said bolt reciprocates within the chamber of said receiver.

9. A semi-automatic firearm comprising: a receiver having a longitudinal chamber formed therein; means for inserting one cartridge at a time into said receiver and moving the inserted cartridge to a firing chamber; a firing pin means movably mounted in said longitudinal chamber for striking and firing a respective cartridge positioned in said firing chamber; a striker slidably mounted in said chamber in alignment with and biased toward said firing pin means, said striker being movable between a cocked position and firing pin striking position; a movably mounted sear rearwardly spaced from said firing pin means and movable between a striker engaged position and a disengaged position, said sear normally assuming said striker engaged position where it acts to hold said striker in said cocked position said sear being further operative to disengage said striker allowing the latter to strike said firing pin means; a trigger mechanism operatively connected to said sear for moving the same from said striker engaged position to said disengaged position and back to said striker engaged position; a safety interlock mechanism associated with said receiver and operative to lock and unlock said sear; a bolt slidably mounted in said chamber between said striker and firing point and biased toward said firing point, said bolt being aligned with said striker and operative upon firing to recoil and engage said striker, causingsaid striker to be moved back to said cocked position for engagement with said sear; an extractor and ejector assembly carried by said bolt and including a pivotably mounted shell rim hook adapted to engage and extract the cartridge shell from the firing point and a pivotably mounted ejector arm adapted to engage the extracted shell and eject the same from the receiver; means for actuating said extractor and ejector assembly in response to the recoil movement of said bolt, said activating means including cam means formed along said internal chamber of said receiver for engaging said ejector arm and biasing the same toward the shell causing the shell to be ejected from said receiver, said activating means further including spring bias means for engaging both said shell rim hook and said ejector arm, said spring biasing means being operative to normall'y bias said shell rim hook into engagement with the rim of the particular cartridge located at the firing point and further operative to normally bias said ejector arm away from the cartridge shell; and means for manually moving said striker back to said cocked position where said striker is engaged and held by said sear, thereby enabling said firearm to be cocked in the absence of a recoil movement from said bolt.

10. The semi-automatic firearm of claim 9 wherein said trigger mechanism comprises: a spring loaded trigger; an interconnecting link pivotably mounted to said trigger and movably responsive to the movement of said trigger; and a spring biased sway link-connected to said sear and engageable with said interconnecting link,

whereby the actuation of said' trigger results in the movement of said sway link which in turn moves said sear from the striker engaged position to said disengaged position, allowing said striker to move toward said firing pin means.

11. The semi-automatic firearm of claim 10 wherein said safety interlock mechanism comprises: an elongated safety rod shaft extending through an opening formed within said sear; a safety lock stop fixed to the end of said safety rod shaft and operative to prevent said sear from moving from the striker engaged position to said disengaged position when disposed within the opening of said sear; and a thumb switch disposed on said firearm adjacent the rear portion of said re- .ceiver and operatively connected tosaid safety rod shaft for positioning said stop in and out of said sear opening.

12. The semi-automatic firearm of claim 9 wherein said means for inserting one cartridge at a time into said chamber includes a magazine adapted to hold a plurality of cartridges, said magazine including a pair of side by side cartridge chamber separated by a partition extending through said magazine, the upper outer side of each cartridge chamber being tapered inwardly toward each other so as to converge the upperly moving cartridges of each chamber into single file for feeding into said receiver.

. 13. The semi-automatic firearm of claim 12 wherein said means for inserting one cartridge at a timeinto said receiver further includes a cartridge feed guide secured to the underside of said bolt adjacent an upper open area of said magazine, said cartridge feed guide being adapted to scoop a single cartridge at a time from the upper open area of said magazine and to urge the cartridge toward said firing point.

14. The semi-automatic firearm of claim 13 wherein said firing pin means is engaged with said bolt and movable therewith. 

1. A semi-automatic firearm comprising: a receiver having a longitudinal chamber formed therein; means for inserting one cartridge at a time into said receiver and moving the inserted cartridge to a firing chamber; a firing pin means movably mounted in said longitudinal chamber for striking and firing a respective cartridge positioned in said firing chamber; a striker assembly mounted in said chamber in alignment with and biased toward said firing pin means, said striker being moVable between a cocked position and firing pin striking position; a movably mounted sear rearwardly spaced from said firing pin means and movable between a striker engaged position and a disengaged position, said sear normally assuming said striker engaged position where it acts to hold said striker in said cocked position, said sear being further operative to disengage said striker allowing the latter to strike said firing pin means; a trigger mechanism operatively connected to said sear for moving the same from said striker engaged position to said disengaged position and back to said striker engaged position; a safety interlock mechanism associated with said receiver and operative to lock and unlock said sear; a bolt slidably mounted in said chamber between said striker and firing point and biased toward said firing point, said bolt being aligned with said striker and operative upon firing to recoil and engage said striker, causing said striker to be moved back to said cocked position for engagement with said sear; a bolt shaft fixed to said bolt and extending rearwardly therefrom through the internal chamber formed within said receiver; a stop fixed intermediately on said bolt shaft; a bolt return spring disposed between said stop and the rear portion of said receiver, thereby biasing said bolt toward said firing point; an extractor and ejector assembly carried by said bolt; means for actuating said extractor and ejector assembly in response to the recoil movement of said bolt; and means for manually moving said striker back to said cocked position where said striker is engaged and held by said sear, thereby enabling said firearm to be cocked in the absence of a recoil movement from said bolt.
 2. The semi-automatic firearm of claim 1 wherein said extractor and ejector assembly comprises a pivotably mounted shell rim hook adapted to engage and extract the cartridge shell from the firing point; and a pivotably mounted ejector arm adapted to engage the extracted shell and eject the same from the receiver.
 3. The semi-automatic firearm of claim 2 wherein said means for actuating said extractor and ejector assembly comprises cam means formed along said internal chamber of said receiver for engaging said ejector arm and biasing the same toward the shell causing the shell to be ejected from said receiver.
 4. The semi-automatic firearm of claim 3 wherein said means for actuating said extractor and ejector assembly further includes spring biased means for engaging both said shell rim hook and said ejector arm, said spring biasing means being operative to normally bias said shell rim hook into engagement with the rim of the particular cartridge located at the firing point and further operative to normally bias said ejector arm away from the cartridge shell.
 5. The semi-automatic firearm of claim 1 wherein said manual cocking mechanism comprises: a toggle link pivotably mounted about a transverse axis to said receiver; a finger lever pivotably mounted to said toggle link about an axis parallel to the pivot axis of said toggle link; and a cocking slide secured to said finger lever and engageable with said bolt for pushing the bolt rearwardly against said striker and positioning said striker in said cocked position.
 6. The semi-automatic firearm of claim 1 wherein said striker includes a central opening formed therein for receiving said bolt shaft, and wherein said striker is slidably mounted along said bolt shaft in coaxial relationship therewith.
 7. The semi-automatic firearm of claim 6 including a striker spring disposed between said striker and the rear portion of said receiver unit, with said striker being disposed outwardly of said bolt return spring.
 8. The semi-automatic firearm of claim 7 including an open sleeve disposed in the rear portion of the internal chamber formed within said receiver, said sleeve separating said bolt return spring from said striker spring and aligned so as to receive said bolt shaft therethrough as said bolt reciprocates Within the chamber of said receiver.
 9. A semi-automatic firearm comprising: a receiver having a longitudinal chamber formed therein; means for inserting one cartridge at a time into said receiver and moving the inserted cartridge to a firing chamber; a firing pin means movably mounted in said longitudinal chamber for striking and firing a respective cartridge positioned in said firing chamber; a striker slidably mounted in said chamber in alignment with and biased toward said firing pin means, said striker being movable between a cocked position and firing pin striking position; a movably mounted sear rearwardly spaced from said firing pin means and movable between a striker engaged position and a disengaged position, said sear normally assuming said striker engaged position where it acts to hold said striker in said cocked position, said sear being further operative to disengage said striker allowing the latter to strike said firing pin means; a trigger mechanism operatively connected to said sear for moving the same from said striker engaged position to said disengaged position and back to said striker engaged position; a safety interlock mechanism associated with said receiver and operative to lock and unlock said sear; a bolt slidably mounted in said chamber between said striker and firing point and biased toward said firing point, said bolt being aligned with said striker and operative upon firing to recoil and engage said striker, causing said striker to be moved back to said cocked position for engagement with said sear; an extractor and ejector assembly carried by said bolt and including a pivotably mounted shell rim hook adapted to engage and extract the cartridge shell from the firing point and a pivotably mounted ejector arm adapted to engage the extracted shell and eject the same from the receiver; means for actuating said extractor and ejector assembly in response to the recoil movement of said bolt, said activating means including cam means formed along said internal chamber of said receiver for engaging said ejector arm and biasing the same toward the shell causing the shell to be ejected from said receiver, said activating means further including spring bias means for engaging both said shell rim hook and said ejector arm, said spring biasing means being operative to normally bias said shell rim hook into engagement with the rim of the particular cartridge located at the firing point and further operative to normally bias said ejector arm away from the cartridge shell; and means for manually moving said striker back to said cocked position where said striker is engaged and held by said sear, thereby enabling said firearm to be cocked in the absence of a recoil movement from said bolt.
 10. The semi-automatic firearm of claim 9 wherein said trigger mechanism comprises: a spring loaded trigger; an interconnecting link pivotably mounted to said trigger and movably responsive to the movement of said trigger; and a spring biased sway link connected to said sear and engageable with said interconnecting link, whereby the actuation of said trigger results in the movement of said sway link which in turn moves said sear from the striker engaged position to said disengaged position, allowing said striker to move toward said firing pin means.
 11. The semi-automatic firearm of claim 10 wherein said safety interlock mechanism comprises: an elongated safety rod shaft extending through an opening formed within said sear; a safety lock stop fixed to the end of said safety rod shaft and operative to prevent said sear from moving from the striker engaged position to said disengaged position when disposed within the opening of said sear; and a thumb switch disposed on said firearm adjacent the rear portion of said receiver and operatively connected to said safety rod shaft for positioning said stop in and out of said sear opening.
 12. The semi-automatic firearm of claim 9 wherein said means for inserting one cartridge at a time into said chamber includes a magazine adapted to hold a plurAlity of cartridges, said magazine including a pair of side by side cartridge chamber separated by a partition extending through said magazine, the upper outer side of each cartridge chamber being tapered inwardly toward each other so as to converge the upperly moving cartridges of each chamber into single file for feeding into said receiver.
 13. The semi-automatic firearm of claim 12 wherein said means for inserting one cartridge at a time into said receiver further includes a cartridge feed guide secured to the underside of said bolt adjacent an upper open area of said magazine, said cartridge feed guide being adapted to scoop a single cartridge at a time from the upper open area of said magazine and to urge the cartridge toward said firing point.
 14. The semi-automatic firearm of claim 13 wherein said firing pin means is engaged with said bolt and movable therewith. 